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NCP5680
Photo Sense
When the photo sense is activated (bit PHEN = 1 in the
CONFIG0 register), the duration of the flash is automatically
reduced when enough light back from the photo target is
sensed through the external sensor. The analog signal present
at the PHSEN pin is amplified (depending upon the gain setup
by the MCU) and compared with the reference programmed
by the MCU: the photo flash pulse is switched OFF when the
input signal is higher than the content of the PHSEN register
(see Figure 19). The built ? in flip flop makes sure that a single
pulse is generated when the light feedback has been
acknowledged by the sensor. The flip flop is reset to the armed
position upon a new trigger flash command (coming from
either the I2C or from the TRGFL pin).
Figure 19. Typical Flash Pulses with Photo Sense Engaged
VSD
+VBat
VSB
D1
PHOTO
PHSEN
R
R/2
GND
GAIN
R1
22k
U1
GND
I2C
R/8
R/4
R/2
R
2R
4R
8R
R
I2C
+VREF
Comparator
Digital Setup
U1
STOP
Figure 20. Basic Photo Sense Structure
On the other hand, the VSD bias voltage is activated
when either the charge pump is active, or the ENPH bit in
the CONFIG0 register is High.
In order to minimize the influence of voltage offset,
operating the Photo Sense trigger level in the 360 mV to
1500 mV range is recommended.
Picture Light
The Picture Light current share the same internal current
mirror used to support the Torch/ Video function. The level
of current is controlled by the TILED register. In addition,
a 200 ms time out is automatically activated when the
TILED current is higher than 100 mA. On the other hand,
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